This is a good place to finish Bw2 (20 CV/CVL) since all end nodes consist of 2-3 CV/CVL in every enemy's fleet composition allowing you to finish it in at most 10 runs while possibly finishing your Bd7 (5 Bosses) along the way.

A perfect place for low level HQ Admiral to catch some BB class; just make sure you have at least 2 CV(L) loaded with torpedo and fighter Aircraft.
The fastest route & easy way to clear quest :
Daily [Bd4,Bd5,Bd6,Bd7].
Weekly [Bw3,Bw4,]

After you level your submarines above level 20 and upgrade them to 4-5 stars, you can use them to grind 2-3 for some Daily and Weekly quests, as well as picking up resources.

1. A fleet which contains at least 3 submarines is recommended. The more submarines you use, the easier clearing the map will be.

2. Submarines with high luck should be placed at the bottom of the fleet list to increase their chance of performing cut-in attacks on the stronger enemies during night battles. Doing this can help you achieve an A or S rank victory, especially if you have to fight the enemy fleet located at node G.

3. Submarines should be fully modernized (at least fully upgraded torpedo attack and armor) and non-remodeled because non-remodeled submarines don't cost very much time to repair or very many resources to resupply (especially ammo). Please note that compared to a non-remodeled submarine, a remodeled sub will take twice the amount of time to repair.

4. This method does not guarantee victory every time, especially if you hit the boss node and have an unlucky run.

If you are aiming for the boss node and end up going down the A-B route on 2-4, just end the sortie. You will run out of fuel and ammo by the time you get to boss node. For highest EXP gain, end the sortie around the G-H/-I node.

A-F route will guarantee you a boss fight.

A more conventional way to finish 2-4 is using 「BBx4 CVx2」or「BBx3 CVx3」. (BBs are stronger; Modernizing/Leveling them is highly recommended).

Subs can be a cheap way to clear the map, but will require a lot of patience. This generally involves trying over and over so you can avoid the highly dangerous line abreast formations and get to the boss node. It is possible to clear 2-4 with a single moderately leveled, maxed armor sub. Consider farming 1-5 if you are in need of subs.

I-K branching rule unclear (please post a comment below if you were sent to K.)

K

L

Medium sized ships=CA/CAV/CVL

Small sized ships=DD,CL?CLT?

Tips

A certain amount of ELoS (new equation) is required to reach the boss node

Below 57.2 will not go H to L

At least 70.4 guarantees H to L

There are three routes to the boss node:

North route, 3 battles (A-D-H-L)

South route, 3 battles (B-E-H-L)

South route, 4 battles (B-E-I-L)

North route, 3 battles (A-D-H-L):

Only two battles before the boss node. The second node is a night battle node

Recommended fleet composition: 2CAV 3CA(V) 1CLT

No BB(V) or CV(L) are allowed for this route

Two ships need to be each equipped with a Drum Canister in order to guarantee going to node A

It's possible to bring 0-2 CLT

Zero makes the first node more dangerous because it's more likely for an enemy to survive until the torpedo phase. On the other hand, a high level (Kai ni) CA or Prinz Eugen Kai are sturdier and less likely to get one-shot to heavy "red" damage.

Two makes achieving the necessary ELoS to reach the boss more difficult, but it is feasible, especially at lower HQ levels

North route (including boss node) doesn't have any enemy carriers, so it's possible to get AS+ with just seaplane bombers, enabling Artillery Spotting

Double attack setups (both day and night) are recommended for consistency

Akashi will drop with a small chance in 2-5 only for Admirals who have never gotten her before. If you already have her, she will not drop in this map anymore. However, Akashi is still obtainable in maps like 3-5 or 6-2.